KSZ8721BLA4TR Micrel Semiconductor, Inc., KSZ8721BLA4TR Datasheet
KSZ8721BLA4TR
Manufacturer Part Number
KSZ8721BLA4TR
Description
IC PHY 1CH 10/100MBPS 48LQFP T/R
Manufacturer
Micrel Semiconductor, Inc.
Datasheet
1.KSZ8721BLA4TR.pdf
(32 pages)
General Description
Operating at 2.5 volts to meet low voltage and low power
requirements, the KS8721B/BT is a 10BaseT/100BaseTX/
FX Physical Layer Transceiver, which provides an MII to
transmit and receive data. It contains the 10BaseT Physical
Medium Attachment (PMA), Physical Medium Dependent
(PMD), and Physical Coding Sub-layer (PCS) functions.
Moreover, the KS8721B/BT has on-chip 10BaseT output
filtering, which eliminates the need for external filters and
allows a single set of line magnetics to be used to meet
requirements for both 100BaseTX and 10BaseT.
The KS8721B/BT can automatically configure itself for 100 or
10 Mbps and full or half duplex operation, using on-chip Auto-
Negotiation algorithm. It is an ideal choice of physical layer
transceiver for 100BaseTX/10BaseT applications.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Functional Diagram
April 2005
KS8721B/BT
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
TX+
TX-
RX+
RX-
XO
XI
Transmitter
PLL
Wander Correction
10BaseT
Receiver
MLT3 Decoder
Adaptive EQ
NRZI/NRZ
Base Line
Shaper
10/100
Pulse
MLT3 Encoder
NRZ/NRZI
Negotiation
PWRDWN
Recovery
Down or
Saving
Power
Clock
Auto
1
Features
• Single chip 100BaseTX/100BaseFX/10BaseT physical
• 2.5V CMOS design, power consumption <200mW
• Fully compliant to IEEE 802.3u standard
• Supports Media Independent Interface (MII) and
• Supports 10BaseT, 100BaseTX and 100BaseFX with
• Supports power down mode and power saving mode
• Configurable through MII serial management ports or via
• Supports auto-negotiation and manual selection for
• On-chip built-in analog front end filtering for both
2.5V 10/100BasTX/FX MII Physical Layer Transceiver
layer solution
(excluding output driver current )
Reduced MII (RMII)
Far_End_Fault Detection
external control pins
10/100Mbps speed and full/half-duplex mode
100BaseTX and 10BaseT
Manchester Encoder
Manchester Decoder
4B/5B Encoder
4B/5B Decoder
Parallel/Serial
Parallel/Serial
Serial/Parallel
Serial/Parallel
Descrambler
Scrambler
KS8721B/BT
Rev. 2.3
Controller
Registers
Interface
MII/RMII
Driver
LED
and
TXD3
TXD2
CRS
MDIO
MDC
RXD3
RXD2
COL
SPD
TXD1
TXD0
TXER
TXC
TXEN
COL
RXD1
RXD0
RXER
RXDV
RXC
LINK
FDX
M9999-041405
Micrel, Inc.
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